GB2060827A - Fluid shut-off valve - Google Patents
Fluid shut-off valve Download PDFInfo
- Publication number
- GB2060827A GB2060827A GB8024613A GB8024613A GB2060827A GB 2060827 A GB2060827 A GB 2060827A GB 8024613 A GB8024613 A GB 8024613A GB 8024613 A GB8024613 A GB 8024613A GB 2060827 A GB2060827 A GB 2060827A
- Authority
- GB
- United Kingdom
- Prior art keywords
- permanent magnet
- valve body
- valve seat
- valve
- solenoid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 44
- 239000000126 substance Substances 0.000 claims description 6
- 239000000696 magnetic material Substances 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000000446 fuel Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/08—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet
- F16K31/082—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet using a electromagnet and a permanent magnet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
- F16K17/366—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position the closure member being a movable ball
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Safety Valves (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
A fluid shut-off valve is provided which comprises a magnetic valve body 5 provided in a non- magnetic hollow casing 1 for movement between a first position to open a fluid passage 3 and a second position on a valve seat 4 to close the passage, and an annular permanent magnet 8 provided outside said casing and urged toward the periphery of the valve seat 4 by an elastic spring 10. The valve body is normally held to the first position but is allowed to move to the second position by the magnetic force of the permanent magnet at a predetermined condition e.g. earthquake shock or in response to actuation of a solenoid 13 upon a leak being detected. The magnet 8 is moved against the force of the spring 10 to reset the valve. <IMAGE>
Description
SPECIFICATION
Fluid shut-off device
This invention relates to a device for shutting off the flow of fluid, such as gaseous fuel, in case of emergency such as an earthquake or accidental leakage of explosive gas.
In the case of an earthquake or accidental leakage of explosive gaseous fuel, it is required to shut off the flow of the fuel from a supply pipe or tank without fail to avoid secondary accidents caused by explosion of the gaseous fuel. To this end, many fluid shut-off devices have been provided hitherto.
However, most of them are complicated in structure, unreliable in operation or expensive in manufacturing cost.
Accordingly, an object of the present invention is to provide a fluid shut-off device which is very simple in structure, reliable in operation and inexpensive in manufacturing cost.
Another object of the present invention is to provide a fluid shut-off device which is operated by an earthquake and/or in connection with a detector for gas leakage.
A further object of the present invention is to provide a fluid shut-off device which can be reset very easily by one action from an operative shut-off position.
Still another object of the present invention is to provide a fluid shut-off device which is operated very accurately by a small supply of electric current and which can maintain the operated position without any further supply of electric current.
Summary of the Invention
According to the present invention, a fluid shut-off device is provided which comprises a casing made of non-magnetic material, through which a fluid passage is formed for connecting with a fluid supply line. The casing also has therein a valve chamber in communication with the passage and valve seat between the passage and the valve chamber. A valve body made of magnetic substance is provided in the valve chamber for movement between a first position separated from the valve seat to open the passage and a second position on the valve seat to close the passage. Provided outside the casing is an annular permanent magnet, which is slidable thereon and urged toward the periphery of the valve seat by an elastic spring means.The valve body is held to the first position but is allowed to move to the second position by magnetic force of the permanant magnet at a predetermined condition.
Preferably, a first stopper is provided outside the casing near the periphery of the valve seat and the annular permanent magnet is normally pressed against the first stopper. The valve chamber has a second stopper therein which is separated from the valve seat for a space larger than the dimensions of the valve body. The valve body is urged against the second stopper by a spring member whereat the magnetic force of the permanent magnet is not strong enough to attract the valve body on the valve seat against the spring member.
The valve body is made to be moved away from the second stopper toward the valve seat against the spring force of the spring member and attracted to the valve seat by the magnetic force of the permanent magnet when subjected to an earthquake having a predetermined magnitude.
More preferably, the fluid shut-off device comprises a solenoid provided at the periphery of the casing adjacent to the elastic spring means and a cylindrical magnetic core member provided at the interior of the valve chamber enclosed by the solenoid. The valve body is provided between the valve seat and the cylindrical core member and contacts the end of the cylindrical magnetic member at the inoperative position. It is arranged that when an electric current is supplied to the solenoid, the valve body is separated from the cylindrical magnetic member and moved to the valve seat by the magnetic force of the permanent magnet.
Other objects and features of the present invention will become apparent from the following detailed description of preferred embodiments of the present invention, when taken in conjunction with the accompanying drawings, in which:
Brief Description of the Drawings
Figures 1(a) to 1(c) are sectional views showing a fluid shut-off device according to a first embodiment of the present invention, wherein Fig. 1 (a) shows an inoperative position, Fig. 1 (b) shows an operative position and Fig. 1 (c) shows a resetting position,
Figure 2 is a sectional view showing a fluid shut-off device according to a second embodiment of the present invention, wherein solid lines show an inoperative position and dotted lines show an operated position,
Figure 3 is a sectional view showing fluid shut-off device in an inoperative position according to a third embodiment of the present invention,
Figures 4(a) to 4(d) show a fluid shut-off device according to a fourth embodiment of the present invention, wherein Fig. 4(a) shows an inoperative position, Fig. 4(b) shows an operative position, Fig. 4(c) shows a resetting position, and Fig. 4(d) shows a sectional view taken along line D-D in Fig. 4(a),
Figures 5(a) to 5(d) show a fluid shut-off device according to a fifth embodiment of the present invention, wherein Fig. 5(a) shows an inoperative position, Fig. 5(b) shows an operative position, Fig. 5(c) shows a resetting position, Fig. 5(d) shows a resetting of a microswitch, and Fig. 5(e) shows a sectional view taken along line E-E in Fig. 5(a).
Detailed Description of the Invention
Referring to a first embodiment of the present invention, a fluid shut-off device of the present invention shown in Figs. 1 (a) to 1 (c) is provided which comprises an elongated hollow casing 1 made of non-magnetic material.
The casing 1 has end portions 1 (a) and 1 (b) adapted to be connected with hoses (not shown) for the supply of fluid such as gaseous fuel. The casing 1 also has a passage 2 and an enlarged valve chamber 3 therein in communication with a fluid supply line. Provided between the passage 2 and the valve chamber 3 is a semi-spherical valve seat 4 for receiving a ball-shaped valve body 5 contained in the valve chamber 3. The valve body 5 is made of magnetic substance such as soft iron. The valve body 5 is lightly pressed against a stopper member 6 contained in the valve chamber 3 by a relatively weak compression spring 7, which is extending through the passage 2.The stopper member 6 is separated from the valve seat 4 for a space larger than the diameter of the ball-shaped valve body 5, whereby when the valve body 5 is in contact with the stopper member as shown in
Fig. 1(a), the valve seat 4 is open to allow free flow of the fluid through the valve chamber 3 and the passage 2.
Provided outside the casing 1 is an annular permanent magnet 8 which is slidable along the outer periphery of the casing. The permanent magnet 8 is urged against an annular stopper 9 by a coil spring 10 provided between an annular flange 11 on the casing and the permanent magnet 8. The annular stopper 9 is provided near the periphery of the valve seat 4 such that the annular permanent magnet encloses the valve seat at the position where the magnet 8 contacts the annular stopper 9.
The spring force of the relatively weak compression spring 7 in the passage 2 is arranged to allow the valve body 5 to move toward the valve seat 4 beyond a predetermined position when the present device is subjected to an earthquake of a predetermined magnitude.
Also, the magnetic force of the permanent magnet is arranged such that when the valve body 5 is moved toward the valve seat beyond the predetermined position, the valve body is immediately attracted to the center portion of the annular permanent magnet, whereby the valve seat 4 of the valve chamber is closed by the valve body.
Now referring to the operation of the present device, Fig. 1(a) show an inoperative position wherein the annular permanent magnet is in contact with the annular stopper 9 and the ball-shaped valve body 5 is pressed against the stopper member 6 in the valve chamber 3. When the present device is subjected to an earthquake, the ball-shaped valve body 5 can move against the spring 7 in the passage 2. Then, in the event that the magnitude of the earthquake reaches a predeter.
mined valve, the valve body 5 moves toward the valve seat beyond a predetermined position. At this time, the magnetic force of the permanent magnet becomes higher than the spring force and, therefore, the valve body 5 is attracted to the center of the magnet and closes the valve seat, as shown in Fig. 1(b).
At this operative position shown in Fig. 1(b), the valve body 5 remains on the valve seat and keeps closing the fluid passage by the magnetic force of the permanent magnet.
When it is desired to reset the present device, the annular permanent magnet 8 is slided back against the coil spring 10, as shown in
Fig. 1(c). By this sliding back of the magnet 8, the magnetic force applied to the valve body 5 on the valve seat 4 is remarkably reduced and the spring force of the spring 7 in the passage 2 becomes higher than the reduced magnetic force. Accordingly, the valve body is pressed against the stopper member 6 in the valve chamber 3 and takes the inoperative position. Thereafter, although the permanent magnet returns to the normal position shown in Fig. 1(a), the valve body cannot move at all from the inoperative position until the present device is subjected to the subsequent earthquake.
Referring now to a second embodiment of the present invention shown in Fig. 2, a fluid shut-off device of this embodiment is also provided for shutting off fluid flow such as gaseous fuel by detecting an earthquake having a predetermined magnitude. In this second embodiment, in place of the relatively weak compression spring 7 in the first embodiment, a grooved recess 1 2 is formed in the valve chamber 3 for receiving a ball-shaped valve body 5 therein in an inoperative position. Other structures of the fluid shut-off device in the second embodiment are substantially the same as those of the first embodiment.
In operation, when the device is subjected to an earthquake having a predetermined magnitude, the ball-shaped valve body 5 rolls out of the grooved recess 12 toward the valve seat 4 and is attracted on the valve seat by the magnetic force of the annular permanent magnet 8, as shown by dotted lines in Fig. 2.
On the other hand, when the permanent magnet 8 is slided back against the coil spring 10 for resetting of the device, since the magnetic force applied to the valve body 5 is greatly reduced, the valve body rolls down from the valve seat 4 by its gravity and enters into the grooved recess 12. Other operational features of the device according to the second embodiment are substantially same as those of the first embodiment. Accordingly, any further detailed descriptions for the structure and operation of the device according to the second embodiment are omitted herein.
Reference is now made to a third embodiment of the present invention shown in Fig.
3, in which a fluid shut-off device is provided so as to be operated by detecting an earthquake having a predetermined magnitude or by an electric current supplied from a detector for gas leakage or the like. The fluid shut-off device of this embodiment is a modified form of the first embodiment, so that the same reference numerals are applied to the same parts as the first embodiment.
In the device shown in Fig. 3, a solenoid 1 3 is provided at the periphery of the elongated casing 1 adjacent to the annular stopper 9 but opposite to the annular permanent magnet 8. This solenoid 1 3 is arranged in such a manner that the radial and axial central point of the solenoid is slightly separated from the center point of the ball-shaped valve body toward the valve seat 4. The solenoid 1 3 is connected to an electric source (not shown) through a detector (not shown) of gas leakage, which detector closes a switch, when detects the leakage of gaseous fuel, and allows the electric current to be supplied to the solenoid.This solenoid is also arranged that when the electric current is supplied to the solenoid, the magnetic force enough to attract the valve body into the central point of the solenoid is generated. The permanent magnet 8 has such a magnetic force that can attract the valve body 5 to the valve seat 4 against the force of the spring 7, when the valve body is attracted to the central point of the solenoid. Thus, in the event that the electric current is supplied to the solenoid through the detector for gas leakage, the valve body moves to the central point of the solenoid against the force of the spring 7, where it is further attracted by the permanent magnet and closes the valve seat 4. Thereafter, the valve body 5 remains on the valve seat 4 by the magnetic force of the permanent magnet 8 even after the supply of the electric current to the solenoid is stopped.The reset of the valve body 5 to the inoperative position can be made by sliding back the permanent magnet as in the case of the first embodiment.
Other structure and operation of the third emmbodiment shown in Fig. 3 are substantially the same as those of the first embodiment shown in Fig. 1(a) to Fig. (c). Thus, as it could be understood from the disclosure set forth above, the fluid shut-off device of the third embodiment can be operated not only by earthquake but also by the supply of electric current from the detector for gas leakage or the like.
Reference is now made to a fourth embodiment of the present invention shown in Fig.
4(a) to Fig. 4(d). In this fourth embodiment, a cylindrical hollow core member 1 4 made of magnetic substance is provided in a valve chamber 3 separately from a ball-shaped valve body 5 in such a manner that the valve body 5 is positioned between a valve seat 4 and the core member 14. The core member 14 is formed to be slidable in the valve chamber 3 between a pair of stopper flanges 1 5(a) and 1 5(b) formed at the inner periphery of the valve chamber 3. One end of the core member 14 facing to the ball-shaped valve body 5 has a plurality of radial grooves 1 4(a) therein as shown in Fig. 4(d), so that when the valve body 5 contacts the end of the core member 14, radial spaces are formed therebetween to allow free flow of the fluid material.A solenoid 1 6 is provided at the outer periphery of the valve chamber 3 to partially enclose the core member 14 at the inoperative position shown in Fig. 4(a). This solenoid 1 6 is connected to an electric source through a detector (not shown) of the type set forth in the third embodiment. Thus, the solenoid 1 6 is actuated only when the detector is operated. Also provided at the outer periphery of the valve chamber 3 is an annular permanent magnet 17, which is slidable along the periphery of the casing 1 between annular flanges 1 8 and 1 9 thereon.A compression coil spring 20 is provided between the permanent magnet 1 7 and one of the flanges 1 9 which is adjacent to the solenoid 1 6. Thus, the permanent magnet 1 7 is urged toward the other flange 1 8 by the spring 20. The latter flange 1 8 functions as a stopper of the permanent magnet 1 7 and is provided near the periphery of the valve seat 4 such that when the annular permanent magnet 1 7 contacts the flange 18, the valve seat 4 locates at the center portion of the magnet 17.
Referring to the operation of the fluid shutoff device according to the fourth embodiment of the present invention, Fig. 4(a) shows an inoperative position of the device. At this inoperative position, the cylindrical core member 1 4 projects in the right-hand direction from the solenoid by attraction force of the permanent magnet 1 7 and contacts the flanged stopper 15 at the inner periphery of the valve chamber 3. Also, the right-hand end of the core member 1 4 contacts the ballshaped valve body 5.Furthermore, although the permanent magnet 1 7 is urged in the right-hand direction by the compression coil spring 20, the magnet stops moving at the intermediate position not reaching the flange stopper 1 8 due to the magnetic attraction force generated between the cylindrical core member 1 4 and the annular permanent magnet 1 7. In such an inoperative position, when an electric current is supplied to the solenoid through a detector of the type which detects leakage of gaseous fuel or the like, the cylindrical core member 1 4 is attracted in the lefthand direction in Fig. 4 due to the electromagnetic force generated by the actuation of the solenoid 1 6. It should be noted here that the solenoid 1 6 is formed to have a high electromagnetic force enough to attract the core member 14 into the solenoid against the magnetic attraction force-of the permanent magnet 1 7. By the displacement of the core member 1 4 in the left-hand direction, the annular permanent magnet 1 7 cannot stay as it is any more and is moved until collided against the flange stopper 1 8 by the extension of the coil spring 20. By this movement of the permanent magnet, the ball-shaped valve body moves together with it and closes the valve seat 4 as shown in the operative position in Fig. 4(b).At this operative position, the valve body 5 keeps staying on the valve seat 4 by the magnetic force of the permanent magnet 1 7 even after cutting off the supply of electric current to the solenoid 16.
When it is desired to reset the present device into the inoperative position, the permanent magnet 1 7 is slided manually in the left-hand direction against the coil spring 20 until the magnet 1 7 closely approaches the solenoid 19, as shown in Fig. 4(c). At this time, the valve body 5 is moved in the same left-hand direction as it is magnetically attracted by the permanent magnet. Thereafter, when the holding hand on the permanent magnet is removed, the magnet 1 7 is moved in the right-hand direction by the force of the spring 20 and, at the same time, the cylindrical core member 14 is moved in the same direction as it is attracted by the magnetic force of the permanent magnet.At the position where the right-hand end of the core member 1 4 collides against the annular flange 1 5(a) in the valve chamber, the core member is restricted from moving in the right-hand direction any more and the annular permanent magnet 1 7 stops moving as the magnetic attraction force between the magnet 1 7 and the core member 14 is balanced with the spring force of the coil spring 20.
Reference is now made to a fifth embodiment of the present invention shown in Fig.
5(a) to Fig. 5(e), in which the same reference numerals are adopted to the same parts as the previous embodiments set forth above. In this embodiment, a stationary cylindrical core member 21 is provided in a valve chamber 3.
This core member 21 is enclosed by a solenoid 1 6 provided at the outer periphery of casing 1. Also provided at the outer periphery of the casing 1 around the valve seat 4 is an annular permanent magnet 1 7 which is urged in the right-hand direction by a compressed coil spring 20. At the inoperative position shown in Fig. 5(a), the permanent magnet 1 7 is pressed against a microswitch 22 by a compression coil spring 20, which microswitch bears in turn against a flange stopper 18. This microswitch 22 is used for the reset of a detector of the type set forth above, through which an electric current is supplied to the solenoid 16. The microswitch 22 in
Fig. 5(a) has already been reset to open the circuit in the detector at this inoperative position.
The fluid shut-off device according to this embodiment was provided on the basis of such fact that when a movable magnetic metal piece such as a ball-shaped valve body 5 in Fig. 4 is in contact with a stationary metal member, the movable metal piece cannot be separated from the stationary metal member so easily and not attracted to a permanent magnet even when the magnet approach the movable metal piece closely upto a relatively short distance and that when the movable metal piece is separated from the metal member for some reason at the above position closely approaching the magnet, the metal piece is immediately attracted to the magnet.Such fact can be explained that the movable metal piece contacting the metal member is magnetized to opposite polarity of the approached permanent magnet, so that by such magnetization of the metal piece, the movable metal piece can firmly attach the stationaly metal member.
In view of the above fact, referring again to the device shown in Fig. 5(a), a ball-shaped valve body 5 made of soft iron is in contact with the stationary core member 21 at the inoperative position. At this position, since the distance between the valve body 5 and the permanent magnet 1 7 is very short, the valve body 5 is magnetized to the opposite polarity of the permanent magnet 1 7 and magnetically attached to the core member 21. When a detector (not shown) of the type set forth above is actuated, an electric current is supplied to the solenoid 1 6 from an electric source through the detector, whereby the stationary core member 21 is magnetized to have a relatively high magnetic state.At the time when the core member 21 is magnetized to have the same polarity as the ball-shaped valve body 5 at the contact point therebetween, the repelling force is generated therebetween and the valve body 5 is separated from the stationary core member 21. At this instant, the valve body is attracted by the, permanent magnet on the valve seat 4 to close the flow of fluid material, as shown in
Fig. 5(b). Preferably, the electric current supplied to the solenoid is direct current by which the core member 21 is magnetized to the same polarity as the valve body at the contact point therebetween. However, alternate current of relatively low frequency such as 50Hz or 60Hz supplied to city houses can be used for operating present device as set forth above.
Once the valve body 5 took the operative position shown by solid line in Fig. 5(b), the valve body 5 remains on the valve seat 4 by the magnetic force of the permanent magnet even after the electric current to the solenoid is interrupted.
When it is desired to reset the device into the inoperative position, the annular permanent magnet 1 7 is slided along the casing 1 toward the solenoid. By such sliding movement of the magnet 17, the valve body 5 is also moved in the same direction by the magnetic attraction therebetween and comes to contact with the stationary core member 21, as shown in Fig. 5(c). Thereafter, the permanent magnet 1 7 is moved to the righthand direction by the coil spring 20 until it contacts the microswitch 22. At the time of moving the permanent magnet 1 7 toward the microswitch 22 the valve body 5 is in contact with the core member 21 and cannot be separated therefrom due to magnetic force induced thereon by the permanent magnet, as set forth above. Then, the annular permanent magnet 1 7 is manually pressed against the microswitch 22 for reset so as to operate the switch and cut off the supply of electric current to the solenoid, as shown in Fig. 5(d).
The ball-shaped valve body 5 in the embodiment shown in Fig. 5(a) to Fig. 5(e) is made of magnetic substance such as soft iron and magnetized by magnetic induction from the annular permanent magnet 1 7. However, this valve body 5 can be made of a permanent magnet hawing a relatively low magnetic force. In this case the annular permanent magnet may not have such a high magnetic force as required in the above embodiment.
Although the present invention has been described with reference to preferred embodiments thereof, many modifications and alterations may be made within the opirit of the present invention.
Claims (9)
1. A fluid shut-off device comprising:
a casing made of non-magnetic material, said casing having therethrough a passage which is adapted to be connected with a fluid supply line, and said casing also having therein a valve chamber in communication with said passage and a valve seat between said passage and said valve chamber;
a valve body made of magnetic substance and provided in said valve chamber for movement between a first position separated from said valve seat to open said passage and a second position on said valve seat to close said passage;
an annular permanent magnet provided outside said casing to be slidable thereon;;
elastic spring means for urging said permanent magnet toward the periphery of said valve seat, and means for holding said valve body to said first position but allowing said valve body to move to said second position by magnetic force of said permanent magnet at a predetermined condition.
2. A fluid shut-off device as claimed in claim 1, wherein said annular permanent magnet is normally pressed against a first stopper by said elastic spring means and locates near the periphery of said valve seat; said valve chamber has a second stopper therein which is separated from said valve seat for a space larger than the dimensions of said valve body; said holding means comprises a spring member urging said valve body against said second stopper whereat the magnetic force of said permanent magnet is not strong enough to attract said valve body on said valve seat against said spring member; said valve body is made to be moved away from said second stopper toward said valve seat against the spring force of said spring member and attracted on said valve seat by the magnetic force of said permanent magnet when subjected to an earthquake having a predetermined magnitude; said permanent magnet is movable away from said first stopper against said elastic spring means to a place where no magnetic force is applied enough to hold said valve body on said valve seat, whereby said valve body is moved to said second stopper by said spring member.
3. A fluid shut-off device as claimed in claim 1, wherein said annularrgermanent magnet is normally pressed against a first stopper by said elastic spring means and locates near the periphery of said valve seat; said valve chamber has a second stopper therein which is separated from said valve seat for a space larger than the dimension of said valve body; said holding means comprises a recess formed in said valve chamber for receiving said valve body therein in contact with said second stopper whereat the magnetic force of said permanent magnet is not strong enough to attract said valve body on said valve seat from said recess; said valve body is made to be moved away from said recess toward said valve seat and attracted on said valve seat by the magnetic force of said permanent magnet when subjected to an earthquake having a predetermined magnitude; said permanent magnet is movable away from said first stopper against said elastic spring means to a place where no magnetic force is applied enough to hold said valve body on said valve seat.
4. A fluid shut-off device as claimed in claim 2 or 3, further comprising a solenoid provided at the periphery of said casing adjacent to said permanent magnet on the opposite side of said elastic spring means, said solenoid being connected to an electric source through a detector which selectively closes an electric circuit for supplying an electric current to said solenoid from said electric source.
5. A fluid shut-off device as claimed in claim 1, further comprising a solenoid provided at the periphery of said casing adjacent to said elastic spring means, and a cylindrical core member made of magnetic substance and provided at the interior of said valve chamber enclosed by said solenoid, wherein said annular permanent magnet is urged toward a first stopper by said elastic spring means, said first stopper being provided outside said casing near the periphery of said valve seat; said valve body is provided between said valve seat and said cylindrical core member and contacts the end of said core member at an inoperative position, said valve body being separated from said core member, when an electric current is supplied to said solenoid, and moved to said valve seat by the magnetic force of said permanent magnet.
6. A fluid shut-off device as claimed in claim 5, wherein said cylindrical core member in said valve chamber is slidable from the inside of said solenoid toward said valve seat until collided against a second stopper on said valve chamber; the magnetic force of said permanent magnet, the spring force of said elastic spring means, and electromagnetic force of said solenoid are determined such that when said permanent magnet is manually moved in one direction close to said solenoid against said elastic spring means and then moved in the other direction, said core member projects by magnetic attraction force of said magnet beyond said solenoid until collided against second stopper where said permanent magnet stops moving against the spring force of said elastic spring means by the magnetic attraction force between said magnet, said core member and said valve body which takes an inoperative position in contact with said core member, and that when an electric current is supplied to said solenoid, said core member is retreated within said solenoid and said permanent magnet is moved by said elastic spring means until collided against said first stopper whereby said valve body is also moved together with said permanent magnet and closes said valve seat.
7. A fluid shut-off device as claimed in claim 5, wherein said cylindrical core member in said valve chamber is stationary; said annular permanent magnet is normally provided at the periphery of said valve seat; said valve body contacts the end of said core member in an inoperative position and is polarized by magnetic induction from said permanent magnet; said solenoid is adapted to be supplied with an electric current which polarizes said core member to the same polarity as said valve body at the contact point therebetween.
8. A fluid shut-off device as claimed in claim 7, wherein an electric current to be supplied to said solenoid is a direct current.
9. A fluid shut-off device as claimed in claim 7, further comprising a microswitch provided between said permanent magnet and said first stopper, said microswitch being con
nected with said detector for resetting the
latter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54096652A JPS5927470B2 (en) | 1979-07-30 | 1979-07-30 | seismic circuit breaker |
| JP9665179A JPS5924306B2 (en) | 1979-07-30 | 1979-07-30 | fluid circuit breaker |
| JP14202879A JPS5666575A (en) | 1979-11-05 | 1979-11-05 | Fluid shut-off valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2060827A true GB2060827A (en) | 1981-05-07 |
| GB2060827B GB2060827B (en) | 1983-08-03 |
Family
ID=27308173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8024613A Expired GB2060827B (en) | 1979-07-30 | 1980-07-28 | Fluid shut-off valve |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3028938A1 (en) |
| FR (1) | FR2462633A1 (en) |
| GB (1) | GB2060827B (en) |
| IT (1) | IT1131780B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2126317A (en) * | 1982-08-21 | 1984-03-21 | Draegerwerk Ag | An electromagnetic ball valve |
| GB2431454A (en) * | 2005-10-21 | 2007-04-25 | Linden Shield Ltd | Valve asembly |
| USRE41262E1 (en) * | 2001-02-23 | 2010-04-27 | Crf Societa Consortile Per Azioni | On-off valve for a gas injection system, particularly of methane, for internal combustion engines |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4489863A (en) * | 1982-02-11 | 1984-12-25 | International Business Machines Corporation | Precision fluid dispense valve |
| US4624443A (en) * | 1982-07-16 | 1986-11-25 | Integrated Flow Systems, Inc. | Fluid-flow control valve |
| DE19922414C1 (en) * | 1999-05-14 | 2000-11-23 | Deutsch Zentr Luft & Raumfahrt | Solenoid operated valve |
| DE19930914A1 (en) * | 1999-07-06 | 2001-01-11 | Aweco Appliance Sys Gmbh & Co | Device to output liquid rinsing agent in dish-washing machine has on side of valve body, second permanent magnet which exerts force via first permanent magnet on valve body |
| DE10249938A1 (en) * | 2002-10-24 | 2004-05-13 | Abb Research Ltd. | Micro system valve has a ferromagnetic valve element moved by permanent magnets on a slider mounting |
| WO2013176572A1 (en) * | 2012-05-21 | 2013-11-28 | Oleg Nikolaevich Zhuravlev | Fixed gate valve for liquid mineral extraction |
| DE102015004691A1 (en) | 2015-04-10 | 2016-10-13 | Bürkle Gmbh | Flow control device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD33053A (en) * | ||||
| GB540928A (en) * | 1940-08-09 | 1941-11-05 | Frederick Jones | Improvements relating to fluid control valves |
| US2405127A (en) * | 1943-06-09 | 1946-08-06 | Hoover Co | Valve |
| AT233341B (en) * | 1961-09-04 | 1964-05-11 | Kromschroeder Ag G | Valve |
| GB1241070A (en) * | 1968-10-28 | 1971-07-28 | John Leroy Follett | Shut off valve |
| JPS5036484B1 (en) * | 1971-06-23 | 1975-11-25 | ||
| US3983890A (en) * | 1975-06-09 | 1976-10-05 | Robertshaw Controls Company | Roll over valve construction and method of making the same |
| US4167194A (en) * | 1977-10-31 | 1979-09-11 | Tsuneki Matsuda | Automatic cutoff and tester apparatus of gas supply |
| US4207912A (en) * | 1978-07-03 | 1980-06-17 | Kiyotada Ichikawa | Emergency shut-off valve |
-
1980
- 1980-07-28 GB GB8024613A patent/GB2060827B/en not_active Expired
- 1980-07-29 IT IT23772/80A patent/IT1131780B/en active
- 1980-07-30 DE DE19803028938 patent/DE3028938A1/en active Granted
- 1980-07-30 FR FR8016783A patent/FR2462633A1/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2126317A (en) * | 1982-08-21 | 1984-03-21 | Draegerwerk Ag | An electromagnetic ball valve |
| USRE41262E1 (en) * | 2001-02-23 | 2010-04-27 | Crf Societa Consortile Per Azioni | On-off valve for a gas injection system, particularly of methane, for internal combustion engines |
| GB2431454A (en) * | 2005-10-21 | 2007-04-25 | Linden Shield Ltd | Valve asembly |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2060827B (en) | 1983-08-03 |
| DE3028938A1 (en) | 1981-02-19 |
| IT8023772A0 (en) | 1980-07-29 |
| FR2462633B1 (en) | 1984-02-10 |
| FR2462633A1 (en) | 1981-02-13 |
| IT1131780B (en) | 1986-06-25 |
| DE3028938C2 (en) | 1990-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920728 |